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The Castaways pin their rescue hopes on a homing pigeon named Walter. Unfortunately, the recipient of Walter's messages is a guy named Burt (Sterling Holloway), who thinks the whole thing is a hoax. Worse is still to come when Gilligan (Bob Denver) and company are obliged to rescue the pigeon from a cave guarded over by a six-foot spider ("played" by celebrated animal imitator Janos Prohaska).